摘要
为提高输电线路输送能力和输电导线的动态增容,对输电线的径向温升现象进行研究分析.以架空输电线为例,首先基于热平衡方程计算导线温度理论值,然后通过建立输电线温度场电磁耦合有限元绞合模型,计算输电线径向温度分布规律,研究不同因素的影响,最后结合温度场的分析结果,分析输电导线动态增容的效果,根据导线的温度分布计算最小的载流量.结果表明:输电线的径向温度分布不均匀,内部温度高,表面温度低;输电导线温度受到载流量、风速、环境温度及时间变化的影响,径向温差一般可达0.58~4.53℃,因此研究架空导线的径向温差,根据导线的温度分布计算保证安全运行的最小载流量,有利于提高输电导线的动态增容,保证线路的运行安全.
In order to improve the transmission capacity and the dynamic capacity increase of transmission line,the radial temperature rise phenomenon of transmission line is studied and analyzed.In this paper,the overhead transmission line is taken as an example.Firstly,the theoretical value of the conductor temperature is calculated based on the heat balance equation.Then,the electromagnetic coupling finite element stranding model of the transmission line temperature field is established to calculate the radial temperature distribution of the transmission line and study the influence of different factors on it.Finally,the effect of dynamic capacity expansion of the transmission line is analyzed based on the analysis results of the temperature field,and the minimum current carrying capacity is calculated according to the temperature distribution of the conductor.The results show that the radial temperature distribution of the transmission line is not uniform.The internal temperature is high and the surface temperature is low;the temperature of the transmission line is affected by different current,wind speed,ambient temperature and time.The radial temperature difference can generally reach 0.58~4.53℃,so the radial temperature difference of the overhead conduc tor is studied.According to the temperature distribution of the wire,the minimum current carrying capacity is calculated,which is beneficial to improve the dynamic capacity of the transmission line so as to ensure the safe operation of the line.
作者
李军辉
贾思棋
杜冬梅
丁亮亮
何青
刘彬
LI Junhui;JIA Siqi;DU Dongmei;DING Liangliang;HE Qing;LIU Bin(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;China Electric Power Research Institute,State Grid,Beijing 100055,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第4期57-66,共10页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金项目(51678548)。
关键词
输电导线
温度场
动态增容
有限元分析
transmission lines
temperature field
dynamic capacity
finite element analysis
